upgraded FETs - Page 8

TypeZer0 · #**106** 12-28-2003, 01:30 PM

i dont think tripod allows direct linking to pics, that's why i can't see it. same goes for the link right below it

#**107** 12-28-2003, 08:09 PM

neurokinetik · #**108** 12-29-2003, 08:49 AM

I'll draw another diagram when I get home tonight...

miketre · #**109** 12-29-2003, 02:59 PM

Quote:

Originally posted by TypeZer0
hmm, have you thoguht about connecting the source directly to the battery? would probably give you slightly less of a voltage drop

Connecting the source directly to the battery also allows you to mod it such that only 4 cells go to the board (and light kit too?) while all 6 cells (or whatever number within the FETs' limit) go to the motor.

Here it is on a Z, but the same concept should be applicable. ->My multi-cell mod

I'm just throwing in ideas, don't flame me for being a Z-lover

I do hope that RS decide to market the XMods over here.

P.S. Nice work Neuro!

LithiumXmod · #**110** 12-29-2003, 03:40 PM

My finished xmod

LithiumXmod · #**111** 12-29-2003, 03:42 PM

another

neurokinetik · #**112** 12-29-2003, 05:59 PM

I take it that it all fits under the body now? It looks much better.

neurokinetik · #**113** 12-29-2003, 06:03 PM

[quote]Originally posted by miketre
[b]Connecting the source directly to the battery also allows you to mod it such that only 4 cells go to the board (and light kit too?) while all 6 cells (or whatever number within the FETs' limit) go to the motor.

Here it is on a Z, but the same concept should be applicable. ->My multi-cell mod

I have to look at the board again and confirm the connections. There's probably another revision to be made. Doing it that way would allow for nice beefy wires that go right from the batteries, through the FETs and into the motor. It would also mean less connections to the circuit board would be needed, which would help in reliability.

That link looks like a good idea. I may have to try something like that. Hell, at that point, why stop at 7.2V? I'd go straight for 12V...

LithiumXmod · #**114** 12-29-2003, 06:24 PM

yup, everything fits under the body now.

http://tinyrc.com/forums/showthread....threadid=16760

neurokinetik · #**115** 12-29-2003, 07:22 PM

Alright, now this should be totally clear to everyone...

*non-working circuit diagram removed. See below for the correct one...*

This is the as-yet-untested version with the sources connected directly to the batteries. That might also be a good place to wire in a power cap...

#**116** 12-29-2003, 10:50 PM

Thanks this helps out a WHOLE lot

Which 7 pins connect back to the main board?

LithiumXmod · #**117** 12-30-2003, 01:10 AM

I will the circuit later tonight. Im at work right now.

miketre · #**118** 12-30-2003, 03:37 AM

Quote:

Originally posted by neurokinetik
That link looks like a good idea. I may have to try something like that. Hell, at that point, why stop at 7.2V? I'd go straight for 12V... [/b]

Hmmm.... I don't think going more than 6 cells with a 35turn motor (S0-3) is a good idea. 12V should be less damaging to a motor with a lower current draw.

neurokinetik -> how's the battery life with the T0-220 FETs? Is it much shorter?
Both P and N channel FETs must be logic level ones right?

LithiumXmod · #**119** 12-30-2003, 03:39 AM

I just try the circuit, is doesn't work.

neurokinetik · #**120** 12-30-2003, 08:27 AM

Quote:

Originally posted by miketre
Hmmm.... I don't think going more than 6 cells with a 35turn motor (S0-3) is a good idea. 12V should be less damaging to a motor with a lower current draw.

neurokinetik -> how's the battery life with the T0-220 FETs? Is it much shorter?
Both P and N channel FETs must be logic level ones right?

I haven't noticed any battery life differences, and I really didn't expect to see any. Both P and N channel FETs are logic level.

As for 12V damaging the motor, well, for my drag car that wouldn't be a concern. The 180 motor is designed to run on 6-12V, and that's straight from Mabuchi. Plus it only really has to last about 5 seconds or less...

Quote:

Originally posted by LithiumXmod
I just try the circuit, is doesn't work.

OK, then here is the circuit that has been tested, and does work. Note that Pin 1 on IC5 and IC6 is the same connection, so as long as you tie the sources of both IRL3705Ns together, only one wire needs to be run to the board to make that connection, hence 7 wires needed instead of 8.